In a combustion chamber, oxygen diffuses through air to the carbon surface where it reacts to make CO and/or CO 2 . The mole fraction of oxygen at z = 0 is 0.21. The reaction at the surface may be...

In a combustion chamber, oxygen diffuses through air to the carbon surface where it reacts to make CO and/or CO₂. The mole fraction of oxygen at z = 0 is 0.21. The reaction at the surface may be assumed to be instantaneous. No reaction occurs in the gas film.

Determine the rate of oxygen diffusion per hour through one square meter of area if

a. only carbon monoxide, CO, is produced at the carbon surface;

b. only carbon dioxide, CO₂, is produced at the carbon surface;

c. the following instantaneous reaction occurs at the carbon surface: